SIDE BY SIDE
GLM 5.1 vs GLM 5 Turbo
Both are GLM models. GLM 5.1 was added to OpenRouter on 2026-04-07, GLM 5 Turbo on 2026-03-15.
| Field | GLM 5.1 | GLM 5 Turbo |
|---|---|---|
| Provider | Z.ai | Z.ai |
| Family | GLM | GLM |
| Province | Blossom Valley | Blossom Valley |
| Context window | 205K tokens | 203K tokens |
| Maximum output | 131K tokens | 131K tokens |
| Input / 1M tokens | $1.40 | $1.20 |
| Output / 1M tokens | $4.40 | $4.00 |
| Accepts | text | text |
| Produces | text | text |
| Reasoning | Yes | Yes |
| Tool use | Yes | Yes |
| Added to OpenRouter | 2026-04-07 | 2026-03-15 |
| Model ID | z-ai/glm-5.1 | z-ai/glm-5-turbo |
Questions and answers
Which is cheaper, GLM 5.1 or GLM 5 Turbo?
GLM 5 Turbo costs less for both input ($1.20 vs $1.40) and output ($4.00 vs $4.40) per million tokens. On input, GLM 5 Turbo is 14% cheaper.
Which has the larger context window?
GLM 5.1: 205K tokens against 203K for GLM 5 Turbo (1× as long).
What can one do that the other cannot?
Nothing among reasoning, tool use and image input: both support reasoning and tool use.
Answers are computed from the 2026-10-24 catalog snapshot.